arch/blackfin/mach-common/irqpanic.c

   1 /*
   2  * File:         arch/blackfin/mach-common/irqpanic.c
   3  * Based on:
   4  * Author:
   5  *
   6  * Created:      ?
   7  * Description:  panic kernel with dump information
   8  *
   9  * Modified:     rgetz - added cache checking code 14Feb06
  10  *               Copyright 2004-2006 Analog Devices Inc.
  11  *
  12  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License as published by
  16  * the Free Software Foundation; either version 2 of the License, or
  17  * (at your option) any later version.
  18  *
  19  * This program is distributed in the hope that it will be useful,
  20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22  * GNU General Public License for more details.
  23  *
  24  * You should have received a copy of the GNU General Public License
  25  * along with this program; if not, see the file COPYING, or write
  26  * to the Free Software Foundation, Inc.,
  27  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/kernel_stat.h>
  32 #include <linux/sched.h>
  33 #include <asm/traps.h>
  34 #include <asm/blackfin.h>
  35
  36 #ifdef CONFIG_DEBUG_ICACHE_CHECK
  37 #define L1_ICACHE_START 0xffa10000
  38 #define L1_ICACHE_END   0xffa13fff
  39 void irq_panic(int reason, struct pt_regs *regs) __attribute__ ((l1_text));
  40 #endif
  41
  42 /*
  43  * irq_panic - calls panic with string setup
  44  */
  45 asmlinkage void irq_panic(int reason, struct pt_regs *regs)
  46 {
  47 #ifdef CONFIG_DEBUG_ICACHE_CHECK
  48         unsigned int cmd, tag, ca, cache_hi, cache_lo, *pa;
  49         unsigned short i, j, die;
  50         unsigned int bad[10][6];
  51
  52         /* check entire cache for coherency
  53          * Since printk is in cacheable memory,
  54          * don't call it until you have checked everything
  55         */
  56
  57         die = 0;
  58         i = 0;
  59
  60         /* check icache */
  61
  62         for (ca = L1_ICACHE_START; ca <= L1_ICACHE_END && i < 10; ca += 32) {
  63
  64                 /* Grab various address bits for the itest_cmd fields                      */
  65                 cmd = (((ca & 0x3000) << 4) |   /* ca[13:12] for SBNK[1:0]             */
  66                        ((ca & 0x0c00) << 16) |  /* ca[11:10] for WAYSEL[1:0]           */
  67                        ((ca & 0x3f8)) | /* ca[09:03] for SET[4:0] and DW[1:0]  */
  68                        0);      /* Access Tag, Read access             */
  69
  70                 SSYNC();
  71                 bfin_write_ITEST_COMMAND(cmd);
  72                 SSYNC();
  73                 tag = bfin_read_ITEST_DATA0();
  74                 SSYNC();
  75
  76                 /* if tag is marked as valid, check it */
  77                 if (tag & 1) {
  78                         /* The icache is arranged in 4 groups of 64-bits */
  79                         for (j = 0; j < 32; j += 8) {
  80                                 cmd = ((((ca + j) & 0x3000) << 4) |     /* ca[13:12] for SBNK[1:0]             */
  81                                        (((ca + j) & 0x0c00) << 16) |    /* ca[11:10] for WAYSEL[1:0]           */
  82                                        (((ca + j) & 0x3f8)) |   /* ca[09:03] for SET[4:0] and DW[1:0]  */
  83                                        4);      /* Access Data, Read access             */
  84
  85                                 SSYNC();
  86                                 bfin_write_ITEST_COMMAND(cmd);
  87                                 SSYNC();
  88
  89                                 cache_hi = bfin_read_ITEST_DATA1();
  90                                 cache_lo = bfin_read_ITEST_DATA0();
  91
  92                                 pa = ((unsigned int *)((tag & 0xffffcc00) |
  93                                                        ((ca + j) & ~(0xffffcc00))));
  94
  95                                 /*
  96                                  * Debugging this, enable
  97                                  *
  98                                  * printk("addr: %08x %08x%08x | %08x%08x\n",
  99                                  *  ((unsigned int *)((tag & 0xffffcc00)  | ((ca+j) & ~(0xffffcc00)))),
 100                                  *   cache_hi, cache_lo, *(pa+1), *pa);
 101                                  */
 102
 103                                 if (cache_hi != *(pa + 1) || cache_lo != *pa) {
 104                                         /* Since icache is not working, stay out of it, by not printing */
 105                                         die = 1;
 106                                         bad[i][0] = (ca + j);
 107                                         bad[i][1] = cache_hi;
 108                                         bad[i][2] = cache_lo;
 109                                         bad[i][3] = ((tag & 0xffffcc00) |
 110                                                 ((ca + j) & ~(0xffffcc00)));
 111                                         bad[i][4] = *(pa + 1);
 112                                         bad[i][5] = *(pa);
 113                                         i++;
 114                                 }
 115                         }
 116                 }
 117         }
 118         if (die) {
 119                 printk(KERN_EMERG "icache coherency error\n");
 120                 for (j = 0; j <= i; j++) {
 121                         printk(KERN_EMERG
 122                             "cache address   : %08x  cache value : %08x%08x\n",
 123                              bad[j][0], bad[j][1], bad[j][2]);
 124                         printk(KERN_EMERG
 125                             "physical address: %08x  SDRAM value : %08x%08x\n",
 126                              bad[j][3], bad[j][4], bad[j][5]);
 127                 }
 128                 panic("icache coherency error");
 129         } else {
 130                 printk(KERN_EMERG "icache checked, and OK\n");
 131         }
 132 #endif
 133
 134 }